JPH0671854A - Printed matter attracting device for printing machine and the same printing device - Google Patents

Abstract

PURPOSE:To permit high quality and stabilized printing continuously by a method wherein a printing platen is provided with a porous attracting board and an evacuating unit for attracting and fixing a printed matter to the attracting board through a vacuum pump. CONSTITUTION:A porous attracting board 1 is attached to a printing platen 2 so that the surface thereof becomes flush with the platen 2. A plurality of printing platens 2 are arrayed at the printing position of a printing machine. Air is sucked through a suction port 3 and an air passing passage 4 by the operation of a vacuum pump 5 and, therefore, the porous attracting board 1 generates a suction force to a printed matter on the surface thereof. Accordingly, a comparatively thin printed matter or card and the like, for example, can be fixed stably when it is set on the attracting board 1. Especially, the whole of the surface of the porous attracting board 1 is constituted of very minute holes and, therefore, an attracting force is exerted evenly on the whole surface of the attracting board; the very fine holes are different from tubular small holes, whereby the fixing of the printed matter can be stabilized. Further, attracting force in the peripheral rim part of the attracting board 1 is designed so as to be slightly stronger than the same at the central part of the attracting board 1 to contrive the stability of fixing in the peripheral rim part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic continuous printing machine, and more particularly to a printing material suction device for holding and holding a printing material during printing, and a printing apparatus equipped with the suction device.

[0002]

2. Description of the Related Art A printing machine has been conventionally used for printing by fixing a material to be printed on a printing platen by vacuum suction. In this type of printing machine, the suction plate of the material to be printed uses a metal plate having a large number of small holes on its surface.

[0003]

When the object to be printed is thin, the conventional suction plate sucks the object to be sucked into the suction holes provided on the surface of the metal plate to affect the printing, and the quality of the printed material is not uniform. There was a problem that occurred.

In addition, when the object to be printed is sucked onto the suction plate and the offset printing is performed, the object to be printed tends to be peeled off from the suction plate due to the adhesive force of the blanket cylinder depending on the stickiness of the blanket cylinder, the stickiness of the ink and the printing position. was there.

As a result, defective products such as misalignment, dents, wrinkles, and folds may occur, making it impossible to stably perform high-quality printing.

The present invention solves the problems described above,
An object of the present invention is to provide a printing material adsorption device and a printing device capable of continuously performing high-quality and stable printing.

It is another object of the present invention to provide a vacuum suction device that suction-holds and fixes a thin plate-shaped object to be printed (work) with high accuracy.

[0008]

To achieve the above object, the present invention uses a porous suction plate as a suction plate of a printing platen.

That is, in the printing apparatus of the present invention, in order to print an object to be printed on the printing platen, a porous suction plate is attached to the printing platen, and the object to be printed is sucked and fixed by a vacuum pump on the porous suction plate. A vacuum exhaust unit is provided. In particular, attach a printing material suction device to a flatbed offset printing machine,
High quality printing is possible.

It is preferable that the porous adsorption disk is a sintered metal of stainless steel or brass.

[0011]

[Function] The object to be printed placed on the porous suction plate is fixed by vacuum suction by the vacuum pump. At this time, the suction force is evenly applied to the entire surface of the object to be printed, so that even if the object to be printed is thin Since it is not sucked and peeled off due to the adhesive force of the blanket cylinder, high quality and stable printing can be continuously performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an adsorption device according to an embodiment of the present invention will be described with reference to FIGS. The porous suction plate 1 is a printing plate 2
It is mounted so that its surface is flush with the printing platen 2. The printing platen 2 is one of a plurality arranged at the printing position of the printing machine, and the arrangement is circular or linear according to the indexing device.

Below the porous suction plate 1, the porous suction plate 1 is provided.
Is provided with a ventilation path 4 which is evenly contacted with. In the case shown in the figure, the ventilation passages 4 are provided in a lattice pattern on the lower part of the porous suction plate 1 except for the projections 8 that support the porous suction plate 1, and at the suction port 3 in the center of the printing platen 2. It is connected.

The suction port 3 is connected to the vacuum pump 5 by a pipe 6. The ventilation path 4 and the suction port 3 form a vacuum exhaust unit. The protrusions 8 are precision-finished so that the porous suction plate 1 can be accurately and stably arranged on the printing platen 2.
In the illustrated case, the protrusions 8 have a two-row configuration, but they may have a three-row or four-row configuration, for example.

The porous adsorption plate 1 is preferably made of sintered metal such as stainless steel or brass.

By operating the vacuum pump 5, air is sucked through the suction port 3 and the ventilation path 4, so that the porous suction plate 1 exerts suction force on the object to be printed on its surface. Therefore, if a relatively thin material to be printed, such as a card, is set on the suction plate 1, it is stably fixed.

In particular, since the entire surface of the porous suction cup 1 has extremely fine holes, unlike the small holes formed in a tubular shape, the suction force acts evenly on the entire surface of the suction cup, and the printed matter is fixed. Stabilize.

Further, the suction force at the peripheral portion of the suction plate 1 may be made slightly larger than the suction force at the central portion so as to stabilize the fixing at the peripheral portion.

3 to 9 show that the substrate suction device 30 is set at the indexing position of the indexing device 51, and the conveying device 6 is used.
6 is an example of a flatbed offset printing apparatus that automatically prints in combination with Nos. 6 and 67.

The printing apparatus of the present invention comprises a flatbed offset printing machine 50, an indexing apparatus 51, a printing material suction apparatus 30, 38,
35, and the like, are configured by transport devices 66 and 67.

The flatbed offset printing machine 50 has a printing platen 33 for forming a printing pattern on the blanket cylinder 34, a printing platen 30 for placing a material to be printed thereon, and a printing pattern for the printing platen 33 on the printing platen 30. A pair of left and right crank arms 54 that make a circular motion (shown by dotted lines) around a crankshaft 56 that is rotated by a blanket cylinder 34 and a motor 58 that is transferred to a material to be printed, and a crank arm 55 whose one end is pin-connected to each crank arm 54. And the pinion gear 57 rotatably connected to the other end of the crank arm 55, and the pinion gear 57, which is fitted to the fixed rack gear 53 and the pinion gear 57 above the pinion gear 57. It has a rack gear 63 and a fleshed roller 59 provided at the upper end of a blanket cylinder support set 60 for supporting the 34.

As shown in FIGS. 7, 8 and 9, the indexing device 51 is installed by dividing the print object suction set 30 into 24 pieces. The print object suction set 30 includes a pipe 36 through a flexible tube 37, a pipe 36, and a snubber 38.
Is connected to the vacuum pump 35. On the other hand, the motor 39 that drives the indexing device is connected to the indexing device drive shaft 42 by the belt 40 and rotates the indexing device.

A seal joint 41 is provided below the portion of the pipe 36 which is rotated by the belt 40. The upper part of the seal joint 41 rotates and the lower part is fixed.

The conveying devices 66 and 67 are known devices,
The description is omitted.

The printing operation will be described with reference to the drawings.

When the motor 58 rotates, the crank arm 54
Along with the circular movement, one end of the crank arm 55 makes a circular movement, and the other end of the crank arm 55 makes a linear movement accordingly, and the pinion gear 57 makes a linear movement while rotating. Pinion gear 57
Meshes with the fixed rack gear 53 on the upper side and meshes with the movable rack gear 63 on the lower side.

Since the pinion gear 57 driven by the other end of the crank arm 55 meshes with the fixed rack gear 53, it moves along the fixed rack gear 53. Along with this, the movable rack gear 63 that meshes with the pinion gear 57 is driven.

Therefore, the blanket cylinder support set 60 is moved by the linear motion of the pinion gear 57 to move the movable rack gear 63.
Will move with.

In FIG. 3, the blanket cylinder support set 60 with the blanket cylinder in the retracted position, ie, the platen 33, is shown in solid lines, and the blanket cylinder 34 in the printing position, ie, the printing platen 30, is shown. 60 is shown by the dashed line.

In this embodiment, as clearly shown in FIG. 5, a gear 62 for rotating the blanket cylinder 34 is provided in the blanket cylinder support set 60, and a fixed rack gear 64 meshing with the gear 62 is provided in the box of the flatbed offset printing press 50. The frame 50b is provided inside the body 50a. As a result, when the blanket cylinder support set 60 moves, the gear 62 meshing with the fixed rack gear 64 rotates, causing the blanket cylinder 34 to rotate. The fixed rack gear 64 may be provided on one side of the blanket cylinder support set 60, and it is not necessary to provide a pair of left and right fixed rack gears.

The frame body 50b is rotatably attached to the box body 50a of the flatbed offset printing machine 50 by a rotary shaft 65,
A rod 70 of a hydraulic cylinder (not shown) is attached to the front end of the frame 50b on the printing platen side. The hydraulic cylinder is fixed to the box body 50a of the flatbed offset printing machine 50. Therefore, the frame body 50b includes the rotating shaft 65 and the rod 70.
Thus, it is supported inside the box 50a.

An upper rack gear 53 and a crank shaft 56 are also fixed to the frame body 50b. On the other hand, the motor 58 is fixed to the box body 50a of the flatbed offset printing machine 50, and the motor 58 and the crankshaft 56 are belt-connected.

Note that FIG. 5 is viewed from the back side of the paper surface with respect to FIG. In FIG. 3, the fixed rack gear 64 is omitted because it is behind the blanket cylinder support set 60.

The printing process in FIGS. 3 to 5 will be described below.

The pinion gear 57 is attached to the rack gear 5 along the upper rack gear 53 fixed to the frame 50b of the printing press.
3 and is driven by the crank arms 54 and 55 by the rotation of the crank shaft 56 by the motor 58, and makes a linear reciprocating motion in the horizontal direction.

Since the pinion gear 57 is fitted with the rack gear 63 at the upper end of the blanket cylinder support set 60, the linear reciprocating motion of the pinion gear 57 causes the blanket cylinder support set 60 to reciprocate similarly.

On the other hand, the pinion gear 62 for rotating the blanket cylinder is fitted to the lower rack gear 64 fixed to the frame 50b of the printing machine, and the pinion gear 62 is moved in accordance with the linear reciprocating motion of the blanket support set 60. The blanket cylinder 34 is rotated while traveling.

After printing, the blanket cylinder 34 is lifted to an upper position by a hydraulic cylinder (not shown) with the rotary shaft 65 as a fulcrum, and makes a return motion without contacting the printing platen 30.

By the above direct reciprocating motion, the blanket cylinder 34 reciprocates between the plate surface plate 33 and the printing surface plate 30 while rotating, thereby printing the material to be printed accurately.

The operation of the indexing device and the suction device will be described below.

The material to be printed is set on the material-to-be-printed adsorption set 30 of the indexing device by the conveying device 66.

This attraction force is, as shown in FIG.
A vacuum pump 35 generates a vacuum pressure on each print-object suction set 30 via a pipe 36 and a flexible tube 37.

Since the upper part of the indexing device is rotated by the action of the seal joint 41 and the lower part of the suction pipe 36 is fixed, the object to be printed is automatically sucked while being surely adsorbed.

Thus, the material to be printed is printed at the printing position, the printing is completed, and the paper is conveyed by the discharging and conveying device 67.

FIG. 4 shows the movement of the blanket cylinder 34 when printing.

Like the flatbed offset printing machine 50, the platen plate 33 and the platen 30 are arranged side by side, and the blanket cylinder 34 running on the platen plate 33 is used for printing.
Drive to. A suction plate 31 is attached to the printing platen 30 at the indexing position by the method shown in FIG. The card 32 to be printed is carried by the carrying device (66, 67),
It is set at the index position.

The card 32 set at the indexing position is
It is fixed by the suction plate 31 attached to the indexing position. Thus, the card 32 is placed in the blanket cylinder 34 at the indexing position on the printing platen of the flatbed offset printing press.
Is printed by running. The suction force of the suction disk 31 is generated by the operation of the vacuum pump 35. In the case of this embodiment, the capacity of the vacuum pump is 100 l / min, and the vacuum pressure is 500 mmHg.
And

Since the suction force of the suction plate 31 is uniform on the entire surface, the card 32 is stably fixed, and is not peeled off due to the stickiness of the blanket cylinder and the stickiness of the ink at the time of printing. Quality printing was done.

Further, in the embodiment shown in FIG. 10, by attaching the suction plate 81 to the rotary press, the blanket cylinder 84 allows the printing object 82 to be printed with high quality as in the flatbed offset printing machine. Was achieved.

In the embodiment shown in FIG. 11, in the apparatus for continuously printing the printing material in a strip shape, the suction board 91 is attached to the cylindrical printing platen 93 to thereby print the strip printing material 9
In No. 2, high quality printing could be continuously performed.

In the above-mentioned embodiment, the flatbed offset printing machine provided with the rack and pinion mechanism for moving the blanket cylinder is used, but it goes without saying that the present invention can be applied to a normal flatbed offset printing machine. .

[0052]

Since the present invention has the above-described structure, it has the following effects.

1) Due to the stable suction force of the printed material,
Since it is fixed uniformly, only a specific part of the printing material is not strongly adsorbed.

2) When printing, due to the stickiness of the blanket cylinder, the stickiness of the ink, and the printing position, the printed material is not peeled off from the suction cup, and high-quality printing is possible and defective printed materials No occurrence at all.

3) Card printing is performed automatically and continuously, and high-quality printing can be performed at high speed even when printing various types of small amounts.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional perspective view of a substrate suction device and a printing platen according to an embodiment of the present invention.

FIG. 2 is a plan perspective view showing a state in which a porous suction plate of the printing material suction device according to the embodiment of the present invention is also removed.

FIG. 3 is a schematic side sectional view of a flatbed offset printing machine according to an embodiment of the present invention.

FIG. 4 is a schematic side view showing a relationship among a printing platen, a platen plate, and a blanket cylinder, which are provided with a printing material adsorption device according to an embodiment of the present invention.

FIG. 5 is a side view showing a blanket cylinder support set of a flatbed offset printing press according to an embodiment of the present invention.

FIG. 6 is a schematic perspective view showing a combination of a flatbed offset printing machine and an indexing device according to an embodiment of the present invention.

FIG. 7 is a schematic plan view showing a combination of a flatbed offset printing machine and an indexing device according to an embodiment of the present invention.

FIG. 8 is a central cross-sectional view and a side view of an indexing device and a printing material suction device according to an embodiment of the present invention.

FIG. 9 is a schematic bottom view showing a state in which a suction device is attached to the indexing device according to the embodiment of the present invention.

FIG. 10 is a schematic side view showing a state in which the adsorption device according to the embodiment of the present invention is installed in a rotary press.

FIG. 11 is a schematic side view in which the suction device according to the embodiment of the present invention is used for a band-shaped printing material.

[Explanation of symbols]

 1, 31, 81, 91 Porous adsorption plate 2, 93 Printing surface plate 3 Suction port 4 Ventilation path 5, 35 Vacuum pump 6, 36 Vacuum piping 32, 82, 92 Printed material 33 Plate surface plate 34, 84, 94 Blanket Body 37 Flexible tube 38 Snubber 39 Motor 40 Belt 41 Seal joint 42 Rotation axis 50 Flatbed offset printing machine 50a Box 50b Frame 51 Indexing device 52 UV irradiator 66 Printed material supply / conveyance device 67 Printed material discharge / conveyance device 53, 64 Fixed rack gear 54, 55 Crank arm 56 Crank shaft 57, 62 Pinion gear 58 Motor 59 Meat roller 60 Blanket cylinder support set 61 Bending roller 63 Movable rack gear 65 Rotating shaft 66, 67 Conveyor device 70 Cylinder rod

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazumi Shimizu 2-1027 Himonya, Meguro-ku, Tokyo Japan Bunka Seiko Co., Ltd.

Claims (3)

[Claims] 1. A printing platen is provided with a porous suction plate and a vacuum exhaust unit for sucking and fixing the printing platen on the printing platen by a vacuum pump when the printing platen is printed on the printing platen. An object-to-be-printed material adsorption device. 2. The adsorption device according to claim 1, wherein the porous adsorption disk is a sintered metal of stainless steel or brass. 3. A printing platen having a printing platen on which a material to be printed is placed, a plate platen on which a printing pattern is formed, and a blanket cylinder that reciprocates between the printing platen and the platen plate. Item 1
A printing device provided with the printing material suction device according to claim 1.